slovodefinícia
reduced instruction set computer
(encz)
reduced instruction set computer, n:
reduced instruction set computer
(wn)
reduced instruction set computer
n 1: (computer science) a kind of computer architecture that has
a relatively small set of computer instructions that it can
perform [syn: reduced instruction set computing, {reduced
instruction set computer}, RISC] [ant: CISC, {complex
instruction set computer}, {complex instruction set
computing}]
reduced instruction set computer
(foldoc)
Reduced Instruction Set Computer
RISC

(RISC) A processor whose design is based on the
rapid execution of a sequence of simple instructions rather
than on the provision of a large variety of complex
instructions (as in a Complex Instruction Set Computer).

Features which are generally found in RISC designs are uniform
instruction encoding (e.g. the op-code is always in the same
bit positions in each instruction which is always one word
long), which allows faster decoding; a homogenous {register
set}, allowing any register to be used in any context and
simplifying compiler design; and simple addressing modes
with more complex modes replaced by sequences of simple
arithmetic instructions.

Examples of (more or less) RISC processors are the {Berkeley
RISC}, HP-PA, Clipper, i960, AMD 29000, MIPS R2000
and DEC Alpha. IBM's first RISC computer was the RT/PC
(IBM 801), they now produce the RISC-based {RISC
System/6000} and SP/2 lines.

Despite Apple Computer's bogus claims for their
PowerPC-based Macintoshes, the first RISC processor used
in a personal computer was the Advanced RISC Machine (ARM)
used in the Acorn Archimedes.

(1997-06-03)
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